linux-kernel - Re: [RFC 1/2] printk/dynamic_debug: Remove cyclic dependency between printk.h and dynamic

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Date:   Thu, 13 Jan 2022 09:35:21 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     jim.cromie@...il.com
Cc:     Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        John Ogness <john.ogness@...utronix.de>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Chris Down <chris@...isdown.name>,
        Marc Zyngier <maz@...nel.org>,
        Andrew Scull <ascull@...gle.com>,
        Will Deacon <will@...nel.org>, Jason Baron <jbaron@...mai.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Jessica Yu <jeyu@...nel.org>
Subject: Re: [RFC 1/2] printk/dynamic_debug: Remove cyclic dependency between
 printk.h and dynamic_debug.h

On Wed 2022-01-12 20:38:57, jim.cromie@...il.com wrote:
> On Wed, Jan 12, 2022 at 5:12 AM Petr Mladek <pmladek@...e.com> wrote:
> >
> > On Tue 2022-01-11 17:01:35, Rasmus Villemoes wrote:
> > > On 11/01/2022 15.30, Petr Mladek wrote:
> 
> 
> > > >  static inline int dynamic_debug_exec_queries(const char *query, const char *modname)
> > > >  {
> > > > -   pr_warn("kernel not built with CONFIG_DYNAMIC_DEBUG_CORE\n");
> > > > +   /* Use raw _printk() to avoid cyclic dependency. */
> > > > +   _printk(KERN_WARNING "kernel not built with CONFIG_DYNAMIC_DEBUG_CORE\n");
> > > >     return 0;
> > > >  }
> > >
> > > And for this one I think the solution is even simpler, as I can't find
> > > any in-tree callers. Perhaps just nuke it entirely?
> >
> > Adding Jim into Cc whether he still has any plans to use this API.
> >
> > Best Regards,
> > Petr
> 
> This EXPORT can go.

Does it mean that the entire function might be removed or just
EXPORT_SYMBOL_GPL() macro, please?

I am especially interested whether we could remove pr_warn()
from the header file. It would help us the get rid of the
cyclic header dependency an easy way.

Best Regards,
Petr